Relationship between Dry Weight at Heading and the Number ofSpikelets on Individual Rice Tillers
The objectives of this study were to identify the growth parameters involved in determining the number of spikelets on an individual tiller (ST) and to elucidate how ST is determined in rice (Oryza sativa L.). We examined the correlation of ST with the dry weight (DWT), leaf area (LAT), and the amou...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2007-01-01
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| Series: | Plant Production Science |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1626/pps.10.430 |
| _version_ | 1818320078824800256 |
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| author | Hiroyuki Shiratsuchi Youichi Ohdaira Jun-ichi Takanashi |
| author_facet | Hiroyuki Shiratsuchi Youichi Ohdaira Jun-ichi Takanashi |
| author_sort | Hiroyuki Shiratsuchi |
| collection | DOAJ |
| description | The objectives of this study were to identify the growth parameters involved in determining the number of spikelets on an individual tiller (ST) and to elucidate how ST is determined in rice (Oryza sativa L.). We examined the correlation of ST with the dry weight (DWT), leaf area (LAT), and the amount of nitrogen (NT) at heading for individual tillers grown under different conditions that were expected to affect spikelet production. In 1999, the japonica rice cultivars “Mineasahi” (short-duration), “Hinohikari” (intermediate-duration), and “Akebono” (long-duration) were transplanted in a paddy field on two different dates (EARLY and LATE). In 2000, Hinohikari was grown under three different treatments (gibberellic acid application, nitrogen topdressing, and thinning of hills at panicle initiation) and without treatment (control). Covariance and partial correlation analyses indicated that ST was positively and essentially correlated with DWT rather than with LAT and NT. The regression of ST on DWT was stable within each cultivar regardless of the treatment, year, tiller order, and number of differentiated spikelets. The slope of the regression was the steepest in the short-duration cultivar. These results suggest that the steep slope is desirable for high-yielding cultivars with large panicles. We conclude that ST is mostly determined by dry matter production of an individual tiller regardless of the number of differentiated spikelets. We present a diagram showing the relationship between dry matter production and the number of differentiated, surviving, and degenerated spikelets on an individual tiller. |
| first_indexed | 2024-12-13T10:19:18Z |
| format | Article |
| id | doaj.art-e0a25be2495b468aad3475faa10f0cba |
| institution | Directory Open Access Journal |
| issn | 1343-943X 1349-1008 |
| language | English |
| last_indexed | 2024-12-13T10:19:18Z |
| publishDate | 2007-01-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Plant Production Science |
| spelling | doaj.art-e0a25be2495b468aad3475faa10f0cba2022-12-21T23:51:13ZengTaylor & Francis GroupPlant Production Science1343-943X1349-10082007-01-0110443044110.1626/pps.10.430111644972Relationship between Dry Weight at Heading and the Number ofSpikelets on Individual Rice TillersHiroyuki Shiratsuchi0Youichi Ohdaira1Jun-ichi Takanashi2National Agricultural Research Center for Western RegionNational Agricultural Research Center for Western RegionNational Agricultural Research Center for Western RegionThe objectives of this study were to identify the growth parameters involved in determining the number of spikelets on an individual tiller (ST) and to elucidate how ST is determined in rice (Oryza sativa L.). We examined the correlation of ST with the dry weight (DWT), leaf area (LAT), and the amount of nitrogen (NT) at heading for individual tillers grown under different conditions that were expected to affect spikelet production. In 1999, the japonica rice cultivars “Mineasahi” (short-duration), “Hinohikari” (intermediate-duration), and “Akebono” (long-duration) were transplanted in a paddy field on two different dates (EARLY and LATE). In 2000, Hinohikari was grown under three different treatments (gibberellic acid application, nitrogen topdressing, and thinning of hills at panicle initiation) and without treatment (control). Covariance and partial correlation analyses indicated that ST was positively and essentially correlated with DWT rather than with LAT and NT. The regression of ST on DWT was stable within each cultivar regardless of the treatment, year, tiller order, and number of differentiated spikelets. The slope of the regression was the steepest in the short-duration cultivar. These results suggest that the steep slope is desirable for high-yielding cultivars with large panicles. We conclude that ST is mostly determined by dry matter production of an individual tiller regardless of the number of differentiated spikelets. We present a diagram showing the relationship between dry matter production and the number of differentiated, surviving, and degenerated spikelets on an individual tiller.http://dx.doi.org/10.1626/pps.10.430Dry weightGibberellic acidNumber of spikeletsRiceSpikelet degenerationSpikelet differentiation |
| spellingShingle | Hiroyuki Shiratsuchi Youichi Ohdaira Jun-ichi Takanashi Relationship between Dry Weight at Heading and the Number ofSpikelets on Individual Rice Tillers Plant Production Science Dry weight Gibberellic acid Number of spikelets Rice Spikelet degeneration Spikelet differentiation |
| title | Relationship between Dry Weight at Heading and the Number ofSpikelets on Individual Rice Tillers |
| title_full | Relationship between Dry Weight at Heading and the Number ofSpikelets on Individual Rice Tillers |
| title_fullStr | Relationship between Dry Weight at Heading and the Number ofSpikelets on Individual Rice Tillers |
| title_full_unstemmed | Relationship between Dry Weight at Heading and the Number ofSpikelets on Individual Rice Tillers |
| title_short | Relationship between Dry Weight at Heading and the Number ofSpikelets on Individual Rice Tillers |
| title_sort | relationship between dry weight at heading and the number ofspikelets on individual rice tillers |
| topic | Dry weight Gibberellic acid Number of spikelets Rice Spikelet degeneration Spikelet differentiation |
| url | http://dx.doi.org/10.1626/pps.10.430 |
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